mirror of
https://github.com/JuliaFEM/JuliaFEM.jl.git
synced 2026-09-20 10:08:31 +00:00
Jukka Aho
7b6fcfdaf5
- Create src/basis/ directory structure - Copy all FEMBasis.jl source files verbatim: - abstract.jl: AbstractBasis type definition and interface - create_basis.jl: Metaprogramming for basis generation - lagrange_*.jl: All Lagrange element bases (Seg, Quad, Tri, Tet, Hex, Wedge, Pyr) - nurbs*.jl: NURBS basis functions - math.jl: jacobian, grad, interpolate functions - subs.jl, vandermonde.jl: Symbolic/mathematical utilities Strategy: Copy first, integrate later (safest approach) Next: Integrate into src/JuliaFEM.jl module
38 lines
756 B
Julia
38 lines
756 B
Julia
# This file is a part of JuliaFEM.
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# License is MIT: see https://github.com/JuliaFEM/FEMBasis.jl/blob/master/LICENSE
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""" NURBS segment. """
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mutable struct NSeg <: AbstractBasis{1}
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order :: Int
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knots :: Vector{Float64}
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weights :: Vector{Float64}
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end
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function NSeg()
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NSeg(1,
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[-1.0, -1.0, 1.0, 1.0],
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ones(4))
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end
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function length(basis::NSeg)
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nu = length(basis.knots) - basis.order - 1
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return nu
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end
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function size(basis::NSeg)
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return (1, length(basis))
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end
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function eval_basis!(basis::NSeg, N::Vector, xi::Vec{1})
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pu = basis.order
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tu = basis.knots
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w = basis.weights
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nu = length(tu)-pu-1
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u = xi[1]
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for j=1:nu
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N[j] = w[j]*NURBS(j,pu,u,tu)
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end
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N ./= sum(N)
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return N
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end
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